Somewhat of an odd option, but we use Trello cards since we live in Trello anyway. Two of the most frequently used boards: a "Handbook" for employee matters and

Somewhat of an odd option, but we use Trello cards since we live in Trello anyway. Two of the most frequently used boards: a "Handbook" for employee matters and "Customer Knowledge" where we distill custdev and sales conversations into topic cards. Just paste in new information into the comments section and then work it into the summary in the card description. You can also assign each topic to have an owner to make sure the card stays fresh. When there's a much larger document, we create a card for it and link to a GSuite doc. For dev knowledge however, it's updated in our repos directly (e.g., README)